In DN1, Duke spawns with some kind of energy weapon that shoots what looks to be lightning-bolts. I'm thinking that it's either an ion weapon, or some kind of electrical charge weapon because Dr. Proton's army consists primarily of robots and cyborgs, so it would make sense for Duke to use such a gun (the title-screen shows smoke coming out of its barrel which makes things confusing). On the offside, this gun has never been seen in any of the follow-up games, neither in the main series, nor in any of the spin-offs (unless you count the DN1 graffiti in DNMP). The closest to it, I suppose, could be either the Shrink Ray/ Expander from DN3D, or the DFG from DNF's 'Hail to the icons' dlc. However, since the Shrink Ray/ Expander is implied to be an alien weapon - at least the Shrink Ray is - it's highly unlikely to be it. Likewise, the DFG looks too different and shoots a different kind of energy bolt than the weapon in DN1. In fact, from the primitive DN1 textures it's not even fully clear whether the weapon is supposed to be a pistol or a rifle, although the DN1 title-screen does show it to be some kind of rifle or even a shotgun.
(in-game screenshot)
(title screen)Onto the weapon in DN2. This much is simpler as both the game art1 and the intro cutscene2 show that it's an energy rifle or some kind1, originally belonging to the Rigelatins2. We don't know if the Rigelatins developed it, or captured it from a previously conquered alien species, but this doesn't even matter. It's barrel is vaguely (and strangely) similar to the gun in DN1, implying that it might have been an upscale. If that's the case, then this raises the question on which game's events actually take place first. The canon of DN being what it is, we may never get a proper answer, and with this in mind, I will continue to regard the weapon from DN2 to be different from the one in DN1.
(game art)
(fan re-imagining I found on the internet)The white/ grey "shotgun" in DN3D's arts and cutscenes. We all know it, Duke's sprite carries it regardless of what weapon is actually equipped, Duke is seen carrying it during the post-boss-battle cutscenes, and in the inter-level screen, when he pumps it right before the next level starts. Why it never appeared as a playable weapon in the game itself, I don't know. I mean, the game already has a shotgun, so why not just have this thing instead of it? Still, when I was younger, I thought the RPG was this weapon because it's also grey/ white. Is it possible that this gun was made for the very early versions of DN3D and never removed?
(inter-level screen)And a more misc question, since we're at the topic of Duke's guns and arts. What are these two guns, and why were they also never featured in the games? I remember seeing this artwork and being so excited, so when I got into the game and didn't find these exact guns, I was a tad disappointed.
(art/ title-screen for DN3D)

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